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Old Feb 24, 2010, 11:27 PM   #1
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Default lens diffraction

while i am starting to suffer a bit from LBA
i keep coming accross this lens diffraction thingy
apparently most zoom lenses for DX camera starts at F8 and any stop above this the picture starts to get soft
am i reading this correct

Dave
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Old Feb 25, 2010, 6:45 AM   #2
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Yes, and it's not just APS-C dSLR. It happens with 'Full Frame' dSLRs too, just at a smaller aperture. It's more a function of the pixel pitch than of the sensor size.

See http://diglloyd.com/articles/Diffrac...Challenge.html
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Old Feb 25, 2010, 6:47 AM   #3
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Quote:
Originally Posted by dafiryde View Post
while i am starting to suffer a bit from LBA
i keep coming accross this lens diffraction thingy
apparently most zoom lenses for DX camera starts at F8 and any stop above this the picture starts to get soft
am i reading this correct

Dave
From what I understand, it's more like f11, but it is dependent on lens and body. This doesn't mean the images will be hopelessly soft at smaller apertures. In many cases you have to look very close to see a difference, and it likely will not affect your prints. People often shoot at f32 for macro shots with no ill effects. Diffraction has always been present in photography, even with film, although you get an extra stop or two before it starts becoming somewhat visible. As long as your reasons for stopping down outweigh the possible problems don't worry about it.
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